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Keywords: Walcott Cambrian Geology and Paleontology II text figure 01.jpg Text figure 1 Charles D Walcott Abrupt appearance of the Cambrian Fauna on the North American Continent Smithsonian Miscellaneous Collections Volume 57 Number 1 Publication 1940 City of Washington Published by the Smithsonian Institution August 18 1910 1910 Creator Charles Doolittle Walcott PD-old-80 Walcott Cambrian Geology and Paleontology II |